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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* Project: HARTIK 3.0 Sound Library */ |
| 2 | /* Description: Hard Real TIme Kernel for 8086 compatible */ |
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| 3 | /* Author: Luca Abeni */ |
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| 4 | /* Date: 5/12/1997 */ |
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| 5 | |||
| 6 | /* File: Blaster.C */ |
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| 7 | /* Revision: 3.0 */ |
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| 8 | |||
| 1063 | tullio | 9 | /* |
| 10 | * This program is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; either version 2 of the License, or |
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| 13 | * (at your option) any later version. |
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| 14 | * |
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| 15 | * This program is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | * GNU General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with this program; if not, write to the Free Software |
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| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 23 | * |
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| 24 | */ |
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| 25 | |||
| 2 | pj | 26 | /* Sound Blaster 16 low-level register access functions */ |
| 27 | #include <kernel/kern.h> |
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| 28 | #include "sbio.h" |
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| 29 | |||
| 30 | /* Write in a SB16 mixer register */ |
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| 31 | void sbmixer_write(WORD base, BYTE index, BYTE c) |
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| 32 | { |
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| 33 | ll_out(base + MIXERREGISTER, index); |
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| 34 | ll_out(base + MIXERDATA, c); |
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| 35 | } |
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| 36 | |||
| 37 | /* Read a byte from a SB16 mixer register */ |
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| 38 | BYTE sbmixer_read(WORD base, BYTE index) |
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| 39 | { |
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| 40 | ll_out(base + MIXERREGISTER, index); |
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| 41 | return(ll_in(base + MIXERDATA)); |
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| 42 | } |
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| 43 | |||
| 44 | /* Find a SB16 in the system: return the base I/O address or 0 if not found */ |
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| 45 | WORD sb_probe (void) |
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| 46 | { |
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| 47 | WORD base; |
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| 48 | int done = 0; |
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| 49 | |||
| 50 | base = 0x0200; |
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| 51 | while ((!done) && (base < 0x0270)) { |
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| 52 | base += 0x10; |
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| 53 | done = sbdsp_reset(base); |
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| 54 | } |
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| 55 | if (done == 0) { |
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| 56 | base = 0; |
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| 57 | } |
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| 58 | return base; |
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| 59 | } |
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| 60 | |||
| 61 | /* Reset the SB16 DSP: return 1 if OK, 0 if fail */ |
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| 62 | BYTE sbdsp_reset(WORD base) |
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| 63 | { |
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| 64 | int x; |
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| 65 | |||
| 66 | ll_in(base + DATAAVAILABLE); |
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| 67 | ll_out(base + RESET,0x01); |
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| 68 | ll_in(base + RESET); |
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| 69 | ll_in(base + RESET); |
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| 70 | ll_in(base + RESET); |
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| 71 | ll_in(base + RESET); |
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| 72 | ll_out(base + RESET,0x00); |
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| 73 | for(x = 0; x < 100; x++) { |
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| 74 | if(ll_in(base + DATAAVAILABLE)&0x80) { |
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| 75 | if(ll_in(base + READDATA) == 0xAA) break; |
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| 76 | } |
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| 77 | } |
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| 78 | if(x == 100) |
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| 79 | return 0; |
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| 80 | else return 1; |
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| 81 | } |
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| 82 | |||
| 83 | /* Write in SB16 DSP register */ |
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| 84 | void sbdsp_write (WORD base, BYTE c ) |
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| 85 | { |
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| 86 | while(ll_in(base + WRITEBUFFERSTATUS)&0x80); |
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| 87 | ll_out(base + WRITEBUFFERSTATUS,c); |
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| 88 | } |
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| 89 | |||
| 90 | /* Read a byte from SB16 DSP register */ |
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| 91 | BYTE sbdsp_read (WORD base) |
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| 92 | { |
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| 93 | while(!(ll_in(base + DATAAVAILABLE)&0x80)); |
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| 94 | return(ll_in(base + READDATA)); |
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| 95 | } |